The trends of using biological materials in electronic devices have made great developments in the last few years. Furthermore, the appealed cost features of organic semiconductors represent a bright low-cost, environment compatible, and efficient future for bio & nanotechnologies, especially Bio-organic solar cells which may consider as a noteworthy option for photovoltaic applications. Here, we report a novel single junction organic solar cell based on photosystem I pigment-protein complex. The complex which operated either as photosensitizer and charge generator compound, surprisingly. Photosystem I complexes were extracted from young spinach leaves and used as the active layer of the intended solid-state solar cell device, subsequently. After the characterization of the final cell, our photovoltaic system showed the current density of 3470 mu A cm(-2) which realizes as a notable approach in between photo-system- I based energy conversion systems. (C) 2017 Elsevier B.V. All rights reserved.